Agreed. Reading it, looks like OP is reading too much into things yet fails to understand that each person he listed, those folks have spent years understanding and developing.
I fell into the same trap in the past. I started learning one thing, others were quick to comment on that I should learn this , this, this, and that as well! That caused me to spread out way too thin.
Programming can be overwhelming. Once you start digging into it, you'll then realize how much you don't really know and how much of it is out there.
One of the most revealing lessons to me, as a young programmer, was when my uncle (worked on the Java project when it was Oak, published his own network architecture, distributed systems professor, etc. etc.) asked me which content management system he should use for an important project, and I was able to help him out with that. You'll always know something that the "Greats" don't.
I fell into the same trap in the past. I started learning one thing, others were quick to comment on that I should learn this , this, this, and that as well! That caused me to spread out way too thin.
Programming can be overwhelming. Once you start digging into it, you'll then realize how much you don't really know and how much of it is out there.